// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/child/worker_thread_message_filter.h"

#include "base/threading/thread_task_runner_handle.h"
#include "content/child/thread_safe_sender.h"
#include "content/child/worker_thread_registry.h"
#include "ipc/ipc_message_macros.h"

namespace content {

WorkerThreadMessageFilter::WorkerThreadMessageFilter(
    ThreadSafeSender* thread_safe_sender)
    : main_thread_task_runner_(base::ThreadTaskRunnerHandle::Get())
    , thread_safe_sender_(thread_safe_sender)
{
}

WorkerThreadMessageFilter::~WorkerThreadMessageFilter()
{
}

base::TaskRunner* WorkerThreadMessageFilter::OverrideTaskRunnerForMessage(
    const IPC::Message& msg)
{
    if (!ShouldHandleMessage(msg))
        return nullptr;
    int ipc_thread_id = 0;
    const bool success = GetWorkerThreadIdForMessage(msg, &ipc_thread_id);
    DCHECK(success);
    if (!ipc_thread_id)
        return main_thread_task_runner_.get();
    return WorkerThreadRegistry::Instance()->GetTaskRunnerFor(ipc_thread_id);
}

bool WorkerThreadMessageFilter::OnMessageReceived(const IPC::Message& msg)
{
    if (!ShouldHandleMessage(msg))
        return false;
    // If the IPC message is received in a worker thread, but it has already been
    // stopped, then drop the message.
    if (!main_thread_task_runner_->BelongsToCurrentThread() && !WorkerThread::GetCurrentId()) {
        return false;
    }
    OnFilteredMessageReceived(msg);
    return true;
}

} // namespace content
